Principal English Translation: 

seller; one of the trade group designations
Source: James Lockhart, The Nahuas after the Conquest: A Social and Cultural History of the Indians of Central Mexico, Sixteenth through Eighteenth Centuries (Stanford: Stanford University Press, 1992), 189.

Orthographic Variants: 
Alonso de Molina: 

Namaca. vender algo.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, f. 61v.

Attestations from sources in English: 

Examples of -namacaque:
anamacaque. water sellers.
cacnamacaque. sellers of sandals.
iztanamacaque. salt merchants.